The Marshmallow update for HTC One M8 and One M9 units on AT&T's network will start rolling out today. This was announced by the Taiwanese company's VP of Product Management Mo Versi on Twitter. HTC One (M8 & M9) AT&T owners! Thank you for your patience. Marshmallow OS is approved, OTA to start tomorrow!! Mo Versi (@moversi) May 11, 2016 If you recall, back in April, Versi had revealed a "slight delay" in the roll-out, saying that they expect to receive the approval for the update within a couple of weeks. So, in that context, the update roll out is bang on time. However, given...
Source: http://www.gsmarena.com/marshmallow_rollout_for_at_t_one_m8_and_one_m9_will_begin_today-news-18191.php